Densification of ZrCx-ZrB2 Composites by Reactive Hot Pressing at Low Applied Pressure
| Autor: | Lingappa Rangaraj, Rajaguru Kannan |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Metallurgy Metals and Alloys 02 engineering and technology Plasticity 021001 nanoscience & nanotechnology Condensed Matter Physics Hot pressing 01 natural sciences Indentation hardness Fracture toughness Flexural strength Volume (thermodynamics) Mechanics of Materials 0103 physical sciences Relative density Composite material 0210 nano-technology Powder mixture |
| Zdroj: | Metallurgical and Materials Transactions A. 49:3539-3549 |
| ISSN: | 1543-1940 1073-5623 |
| DOI: | 10.1007/s11661-018-4647-7 |
| Popis: | Dense ZrCx-ZrB2 (10 to 50 vol pct) composites were produced by reactive hot pressing (RHP) of different molar ratios Zr, C, and B powder mixtures at 4 to 7 MPa, 1200 °C for 60 minutes. An applied pressure of 4 MPa was found to be sufficient to produce ZrCx-ZrB2 (10 to 20 vol pct) composites with 96 to 97 pct relative density (RD). However, to achieve similar RD with a higher volume of ZrB2 (≤ 50 vol pct), 7 MPa was required. RHP of the 1.83Zr-0.5C-1.66B powder mixture (50 vol pct ZrB2) at 600 °C to 1200 °C for 5 minutes illustrated sluggishness of the reaction; the plasticity of Zr played a significant role in densification. Microhardness, indention fracture toughness, and three-point flexural strength of the ZrCx-ZrB2 (50 vol pct) composites are 14.7 ± 0.5 GPa, 5.5 ± 0.69 MPa√m, and 609 ± 38 MPa, respectively. Improvement in the mechanical properties of the composites is believed to be in distribution of ZrB2 platelets within the ZrCx matrix. |
| Databáze: | OpenAIRE |
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